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Unformatted text preview: billing (cab4763) hw 1 opyrchal (121104) 1 This printout should have 8 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of 4 . 9 C. The charge on an electron is 1 . 6 10 19 C. How many electrons are transferred from the wool shirt to the plastic rod? Correct answer: 3 . 0625 10 13 . Explanation: Let : q = 4 . 9 C = 4 . 9 10 6 C and e = 1 . 6 10 19 C . The total charge is q = n e e n e = q e = 4 . 9 10 6 C 1 . 6 10 19 C = 3 . 0625 10 13 . 002 10.0 points A particle of mass 13 g and charge 51 C is released from rest when it is 46 cm from a second particle of charge 11 C. Determine the magnitude of the initial ac celeration of the 13 g particle. Correct answer: 1832 . 92 m / s 2 . Explanation: Let : m = 13 g , q = 51 C = 5 . 1 10 5 C , d = 46 cm = 0 . 46 m , Q = 11 C = 1 . 1 10 5 C , and k e = 8 . 9875 10 9 . The force exerted on the particle is F = k e  q 1  q 2  r 2 = m a bardbl vectora bardbl = k e bardbl vectorq bardblbardbl vector Q bardbl m d 2 = k e vextendsingle vextendsingle 5 . 1 10 5 C vextendsingle vextendsingle vextendsingle vextendsingle 1 . 1 10 5 C vextendsingle vextendsingle (0 . 013 kg) (0 . 46 m 2 ) = 1832 . 92 m / s 2 . 003 10.0 points A particle with charge 9 C is located on the xaxis at the point 10 cm , and a second particle with charge 9 C is placed on the xaxis at 6 cm . The Coulomb constant is 8 . 9875 10 9 N m 2 / C 2 . 2 4 6 8 10 2 4 6 8 10 9 C 9 C 7 C x (cm) What is the magnitude of the total elec trostatic force on a third particle with charge 7 C placed on the xaxis at 2 cm ? Correct answer: 0 N. Explanation: Let : q 1 = 9 C = 9 10 6 C , q 2 = 9 C = 9 10 6 C , q 3 = 7 C = 7 10 6 C , x 1 = 10 cm = . 1 m , x 2 = 6 cm = 0 . 06 m , and x 3 = 2 cm = . 02 m ....
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 Spring '10
 Fayngold
 Physics

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